Physicists are interested in the big questions like “Where did we come from?” and “What is all this stuff?”. But the answers to some of these questions, just lead to more questions.
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https://www.space.com/25075-cosmic-inflation-universe-expansion-big-bang-infographic.html.
Why we need inflation: https://www.space.com/42202-why-we-need-cosmic-inflation.html.
https://www.space.com/42261-how-did-inflation-happen-anyway.html.
Inflation review: https://arxiv.org/pdf/hep-ph/0304257.pdf.
Evidence for inflation https://www.forbes.com/sites/startswithabang/2019/05/11/ask-ethan-how-well-has-cosmic-inflation-been-verified/?sh=7ad0a2891d07
GW detection: https://iopscience.iop.org/article/10.1088/1475-7516/2021/01/012
Penrose cyclic cosmology: https://aip.scitation.org/doi/abs/10.1063/1.4727997?journalCode=apc.
New evidence for cyclic universe claimed by Roger Penrose and colleagues
Fine-tuning:
Fundamental constants: https://www.forbes.com/sites/ethansiegel/2015/08/22/it-takes-26-fundamental-constants-to-give-us-our-universe-but-they-still-dont-give-everything/#4118be154b86
Fine-tuning 1: https://www.symmetrymagazine.org/article/fine-tuning-versus-naturalness.
Fine-tuning 2: https://www.pbs.org/wgbh/nova/article/scientific-approaches-to-the-fine-tuning-problem/
Fine-tuning 3: https://www.forbes.com/sites/startswithabang/2019/04/05/fine-tuning-really-is-a-problem-in-physics/
Fine-tuning 4: https://plato.stanford.edu/entries/fine-tuning/
Fine-tuning 5: https://books.google.co.uk/books/about/Just_Six_Numbers.html?id=4XPhAgAAQBAJ&printsec=frontcover&source=kp_read_button&hl=en&redir_esc=y#v=onepage&q&f=false.
Fine-tuning 6: https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/finetuning-of-the-universe-for-intelligent-life/222321D5D4B5A4D68A3A97BBE46AEE45
Anthropic principle: https://www.britannica.com/science/anthropic-principle.